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—There's someone knocking on the door.Wh...

—There's someone knocking on the door.Who         it be?

—It must be Mary.She promised to be here at 8:00.

A.must    B.can    C.shall D.need

 

B 【解析】 试题分析:句意:--有人在敲门。可能会是谁呢?--一定是Mary。她答应八点钟到这里。A. must一定,表主观肯定推测;B. need需要;C. shall将会是;D. can可能,表示怀疑、猜测、惊异(主要用于否定句或疑问句中)。故选B 考点: 考查情态动词的用法。  
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